[FFmpeg-user] Cut-edits with ffmpeg
jpboard2 at yahoo.com
Thu Jul 25 01:57:08 CEST 2013
I'm trying to use ffmpeg to edit AVI files. The video is not mpeg-encoded yet
and each frame is stored in full. I want to do frame-exact edits. I really
want to specify the start and end frame numbers, but it appears ffmpeg doesn't
support that. So, I have to specify a start and end time for each segment, and
then combine the segments with ffmpeg. This is the command I'm using for each
ffmpeg -i in.avi -ss [start] -to end -vcodec copy -acodec copy out.avi
The 'start' and 'end' arguments are floating point numbers like 1.25, etc. My
question is how ffmpeg interprets those numbers. Since floating-point numbers
aren't exact, it isn't always possible to specify the exact position. So what
does ffmpeg do when the 'start' argument doesn't fall exactly on a frame.
Does it start at the closest frame? Does it start at the next frame after
that position? Does it do something else?
Alternatively, if I have the exact start and end frame numbers, how can I then
convert that to exact start and end times?
Thanks for all your wonderful help.
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